We mentioned that any time a web server becomes unusually busy or goes down, traffic is instantly routed to another server. We have a 100% uptime SLA to back that up. That instant, automatic routing is especially beneficial during monthly Windows server updates. The updates cascade across the servers on a controlled schedule, ensuring that there are always available servers. When a web server goes down for an update, all the sites are immediately served from other, active servers. No more web server downtime for scheduled maintenance.